Portable chair



FIG. 1 is a top, front, right perspective view of a portable chair showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a folded front view of an alternative claimed configuration of a portable chair showing our new design thereof;

FIG. 9 is a folded back view thereof; and,

FIG. 10 is a folded left side view thereof.

The broken line shown are included is for the purpose of illustrating portions of the portable chair and forms no part of the claimed design. 

CLAIM The ornamental design for a portable chair, as shown and described. 